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Ozcelikay G, Mollarasouli F, Unal MA, Gucuyener K, Ozkan SA. Ultrasensitive Determination of Glial-Fibrillary-Acidic-Protein (GFAP) in Human Serum-Matrix with a Label-Free Impedimetric Immunosensor. BIOSENSORS 2022; 12:1165. [PMID: 36551133 PMCID: PMC9775015 DOI: 10.3390/bios12121165] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
In this work, immobilizing anti-GFAP antibodies via covalent attachment onto L-cysteine/gold nanoparticles that were modified with screen-printed carbon electrodes (Anti-GFAP/L-cys/AuNps/SPCE) resulted in the development of a sensitive label-free impedance immunosensor for the detection of Glial Fibrillary Acidic Protein (GFAP). The immunosensor's stepwise construction was studied using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). L-cysteine was chosen as the linker between GFAP antibodies and Au NPs/SPCE because it enables the guided and stable immobilization of GFAP antibodies, thus resulting in increased immunosensor sensitivity. As a redox probe, 5 mM of [Fe(CN)6]3-/4- was used to measure the electron-transfer resistance (Ret), which was raised by the binding of antigens to the immobilized anti-GFAP on the surface of the modified electrode. A linear correlation between Rct and GFAP concentration was achieved under optimum conditions in the range of 1.0-1000.0 pg/mL, with an extraordinarily low detection limit of 51.0 fg/mL. The suggested immunosensor was successfully used to detect the presence of GFAP in human blood serum samples, yielding good findings. As a result, the proposed platform may be utilized to monitor central nervous system injuries.
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Affiliation(s)
- Goksu Ozcelikay
- Department of Analytical Chemistry, Ankara University, Ankara 06560, Turkey
| | | | | | - Kıvılcım Gucuyener
- Department of Pediatric Neurology, Gazi University, Ankara 06510, Turkey
| | - Sibel A. Ozkan
- Department of Analytical Chemistry, Ankara University, Ankara 06560, Turkey
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Electrochemical and X-ray Photoelectron Spectroscopy Surface Characterization of Interchain-Driven Self-Assembled Monolayer (SAM) Reorganization. NANOMATERIALS 2022; 12:nano12050867. [PMID: 35269355 PMCID: PMC8912756 DOI: 10.3390/nano12050867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/23/2022] [Accepted: 03/02/2022] [Indexed: 11/16/2022]
Abstract
Herein, we report a combined strategy encompassing electrochemical and x-ray photoelectron spectroscopy (XPS) experiments to investigate self-assembled monolayer (SAM) conformational reorganization onto an electrode surface due to the application of an electrical field. In particular, 3-mercaptopriopionic acid SAM (3MPA SAM) modified gold electrodes are activated with a 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysulfosuccinimide (NHSS) (EDC-NHSS) mixture by shortening the activation time, from 2 h to 15/20 min, labelled as Protocol-A, -B and -C, respectively. This step, later followed by a deactivation process with ethanolamine (EA), plays a key role in the reaction yields (formation of N-(2-hydroxyethyl)-3-mercaptopropanamide, NMPA) but also in the conformational rearrangement observed during the application of the electrical field. This study aims at explaining the high performance (i.e., single-molecule detection at a large electrode interface) of bioelectronic devices, where the 3MPA-based SAM structure is pivotal in achieving extremely high sensing performance levels due to its interchain interaction. Cyclic voltammetry (CV) experiments performed in K4Fe(CN)6:K3Fe(CN)6 for 3MPA SAMs that are activated/deactivated show similar trends of anodic peak current (IA) over time, mainly related to the presence of interchain hydrogen bonds, driving the conformational rearrangements (tightening of SAMs structure) while applying an electrical field. In addition, XPS analysis allows correlation of the deactivation yield with electrochemical data (conformational rearrangements), identifying the best protocol in terms of high reaction yield, mainly related to the shorter reaction time, and not triggering any side reactions. Finally, Protocol-C’s SAM surface coverage, determined by CV in H2SO4 and differential pulse voltammetry (DPV) in NaOH, was 1.29 * 1013 molecules cm−2, being similar to the bioreceptor surface coverage in single-molecule detection at a large electrode interface.
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Melo AMA, Furtado RF, de Fatima Borges M, Biswas A, Cheng HN, Alves CR. Performance of an amperometric immunosensor assembled on carboxymethylated cashew gum for Salmonella detection. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106268] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Rosenthal A, Rauch S, Eichhorn KJ, Stamm M, Uhlmann P. Enzyme immobilization on protein-resistant PNIPAAm brushes: impact of biotin linker length on enzyme amount and catalytic activity. Colloids Surf B Biointerfaces 2018; 171:351-357. [PMID: 30056296 DOI: 10.1016/j.colsurfb.2018.07.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 07/10/2018] [Accepted: 07/23/2018] [Indexed: 11/16/2022]
Abstract
Thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) brushes with terminal click functionality can be used to selectively immobilize enzymes. Exploiting their inherent protein-repellent and thus non-fouling properties, surfaces with specific bioactivity can be created in this way. This report describes the functionalization of alkyne-PNIPAAm brushes with two biotin linkers of different poly(ethylene glycol) (PEG) spacer length via click chemistry and the subsequent immobilization of streptavidin-conjugated horseradish peroxidase (SA-HRP) by the strong interaction between biotin and streptavidin. Spectroscopic ellipsometry is used to quantify the biotin and the SA-HRP amount on the PNIPAAm brushes. Enzyme activities are determined by UV‑vis spectroscopy. A better accessibility to the alkyne-functionalized chain ends for the short biotin-PEG3 linker leads to a higher biotin amount on these PNIPAAm brushes, which in turn results in higher SA‑HRP amounts on biotin-PEG3-modified brushes in the swollen (20 °C) and collapsed state (37 °C) compared to biotin-PEG23-modified ones. For both linkers, an increased immobilization temperature leads to higher SA-HRP amounts due to an enhanced reaction kinetics and mobility. All immobilized SA-HRP amounts are in range of 81-98% monolayer coverage, except for SA-HRP immobilized on biotin-PEG23-modified PNIPAAm brushes at 20 °C, exhibiting only 43% monolayer coverage. A high mobility of the biotin linker combined with a low surface loading of SA-HRP is found to be beneficial for the activity of SA-HRP. Hence, the highest specific activity as measured by HRP-catalyzed 3,3´,5,5´‑tetramethylbenzidine (TMB) oxidation is found for a low SA-HRP amount on biotin-PEG23-modified brushes.
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Affiliation(s)
- Alice Rosenthal
- Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany; Technische Universität Dresden, Physical Chemistry of Polymeric Materials, 01062 Dresden, Germany
| | - Sebastian Rauch
- Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
| | | | - Manfred Stamm
- Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany; Technische Universität Dresden, Physical Chemistry of Polymeric Materials, 01062 Dresden, Germany
| | - Petra Uhlmann
- Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany; Department of Chemistry, Hamilton Hall, University of Nebraska-Lincoln, Lincoln, NE, 68588, United States.
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Alexandre DL, Melo AMA, Furtado RF, Borges MF, Figueiredo EAT, Biswas A, Cheng HN, Alves CR. A Rapid and Specific Biosensor for Salmonella Typhimurium Detection in Milk. FOOD BIOPROCESS TECH 2018. [DOI: 10.1007/s11947-017-2051-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Heinen S, Weinhart M. Poly(glycidyl ether)-Based Monolayers on Gold Surfaces: Control of Grafting Density and Chain Conformation by Grafting Procedure, Surface Anchor, and Molecular Weight. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2076-2086. [PMID: 28191961 DOI: 10.1021/acs.langmuir.6b03927] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For a meaningful correlation of surface coatings with their respective biological response reproducible coating procedures, well-defined surface coatings, and thorough surface characterization with respect to layer thickness and grafting density are indispensable. The same applies to polymeric monolayer coatings which are intended to be used for, e.g., fundamental studies on the volume phase transition of surface end-tethered thermoresponsive polymer chains. Planar gold surfaces are frequently used as model substrates, since they allow a variety of straightforward surface characterization methods. Herein we present reproducible grafting-to procedures performed with thermoresponsive poly(glycidyl ether) copolymers composed of glycidyl methyl ether (GME) and ethyl glycidyl ether (EGE). The copolymers feature different molecular weights (2 kDa, 9 kDa, 24 kDa) and are equipped with varying sulfur-containing anchor groups in order to achieve adjustable grafting densities on gold surfaces and hence control the tethered polymers' chain conformation. We determined "wet" and "dry" thicknesses of these coatings by QCM-D and ellipsometry measurements and deduced anchor distances and degrees of chain overlap of the polymer chains assembled on gold. Grafting under cloud point conditions allowed for higher degrees of chain overlap compared to grafting from a good solvent like ethanol, independent of the used sulfur-containing anchor group for polymers with low (2 kDa) and medium (9 kDa) molecular weights. By contrast, the achieved grafting densities and thus chain overlaps of surface-tethered polymers with high (24 kDa) molecular weights were identical for both grafting methods. Monolayers prepared from an ethanolic solution of poly(glycidyl ether)s equipped with sterically demanding disulfide-containing anchors revealed the lowest degrees of chain overlap. The ratio of the radius of gyration to the anchor distance (2 Rg/l) of the latter coating was found to be lower than 1.4, indicating that the assembly was rather in the mushroom-like than in the brush regime. Polymer chains with thiol-containing anchors of different alkyl chain lengths (C11SH vs C4SH) formed assemblies with comparable degrees of chain overlap with 2 Rg/l values above 1.4 and are thus in the brush regime. Molecular weights influenced the achievable degree of chain overlap on the surface. Coatings prepared with the medium molecular weight polymer (9 kDa) resulted in the highest chain packing density. Control of grafting density and thus chain overlap in different regimes (brush vs mushroom) on planar gold substrates are attainable for monolayer coatings with poly(GME-ran-EGE) by adjusting the polymer's molecular weight and anchor group as well as the conditions for the grafting-to procedure.
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Affiliation(s)
- Silke Heinen
- Institute of Chemistry and Biochemistry, Freie Universitaet Berlin , Takustraße 3, 14195 Berlin, Germany
| | - Marie Weinhart
- Institute of Chemistry and Biochemistry, Freie Universitaet Berlin , Takustraße 3, 14195 Berlin, Germany
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A nanostructured genosensor for the early diagnosis of systemic arterial hypertension. Biomed Microdevices 2015; 17:3. [PMID: 25653060 DOI: 10.1007/s10544-014-9911-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The rapid progress of nanomedicine, especially in areas related to medical imaging and diagnostics, has motivated the development of new nanomaterials that can be combined with biological materials for specific medical applications. One such area of research involves the detection of specific DNA sequences for the early diagnosis of genetic diseases, using nanoparticles-containing genosensors. Typical genosensors devices are based on the use of sensing electrodes - biorecognition platforms - containing immobilized capture DNA probes capable of hybridizing with specific target DNA sequences. In this paper we show that upon an appropriate design of the biorecognition platform, efficient sandwich-type genosensors based upon DNA-AuNPs nanocomplexes can be efficiently applied to the detection of a Systemic Arterial Hypertension (SAH) polymorphism located in intron 16 of the Angiotensin-converter enzyme (ACE) gene. Since SAH is intimately related to heart diseases, especially blood hypertension, its early detection is of great biomedical interest. The biorecognition platforms were assembled using mixed self-assembled monolayers (SAMmix), which provided the immobilization of organized architectures with molecular control. Detection of the DNA target sequence at concentrations down to 1 nM was carried out using electrochemical impedance spectroscopy (EIS). We show that the use of EIS combined with specific nanobiocomplexes represents an efficient method for the unambiguous detection of complementary DNA hybridization for preventative nanomedicine applications.
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Electrodeposition of monodispersed Cu nanoparticles on poly-p-aminobenzene sulfonic acid functionalized glassy carbon electrode and the electrocatalytic reduction toward H2O2. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.04.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Yucesoy DT, Karaca BT, Cetinel S, Caliskan HB, Adali E, Gul-Karaguler N, Tamerler C. Direct bioelectrocatalysis at the interfaces by genetically engineered dehydrogenase. BIOINSPIRED BIOMIMETIC AND NANOBIOMATERIALS 2015. [DOI: 10.1680/bbn.14.00022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Sosna M, Fapyane D, Ferapontova EE. Reconstitution of peroxidase onto hemin-terminated alkanethiol self-assembled monolayers on gold. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.06.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Xiao X, Li H, Wang M, Zhang K, Si P. Examining the effects of self-assembled monolayers on nanoporous gold based amperometric glucose biosensors. Analyst 2014; 139:488-94. [DOI: 10.1039/c3an01670f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Bayram E, Akyilmaz E. A new pyruvate oxidase biosensor based on 3-mercaptopropionic acid/6-aminocaproic acid modified gold electrode. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2013; 42:418-22. [DOI: 10.3109/21691401.2013.815626] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Arya SK, Pui TS, Wong CC, Kumar S, Rahman ARA. Effects of the electrode size and modification protocol on a label-free electrochemical biosensor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:6770-6777. [PMID: 23651210 DOI: 10.1021/la401109r] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In the present work, the effect of a surface modification protocol along with the electrode size has been investigated for developing an efficient, label-free electrochemical biosensing method for diagnosis of traumatic brain injury (TBI) biomarkers. A microdisk electrode array (MDEA) and a macroelectrode with a comb structure (MECS) were modified with an anti-GFAP (GFAP = glial fibrillary acidic protein) antibody using two protocols for optimum and label-free detection of GFAP, a promising acute-phase TBI biomarker. For the MDEA, an array of six microdisks with a 100 μm diameter and, for the MECS, a 3.2 mm × 5.5 mm electrode 5 μm wide with 10 μm spaced comb fingers were modified using an optimized protocol for dithiobis(succinimidyl propionate) (DSP) self-assembled monolayer formation. Anti-GFAP was covalently bound, and the remaining free DSP groups were blocked using ethanolamine (Ea). Sensors were exposed to solutions with different GFAP concentrations, and a label-free electrochemical impedance spectroscopy (EIS) technique was used to determine the concentration. EIS results confirmed that both types of Ea/anti-GFAP/DSP/Au electrodes modified with an optimized DSP-based protocol can accurately detect GFAP in the range of 1 pg mL(-1) to 100 ng mL(-1) with a detection limit of 1 pg mL(-1). However, the cross-use of the MDEA protocol on the MECS and vice versa resulted in very low sensitivity or poor signal resolution, underscoring the importance of proper matching of the electrode size and type and the surface modification protocol.
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Affiliation(s)
- Sunil K Arya
- Bioelectronics Programme, Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), Singapore Science Park II, Singapore.
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Josypčuk B, Fojta M, Yosypchuk O. Thiolate monolayers formed on different amalgam electrodes. Part II: Properties and application. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.02.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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The use of mixed self-assembled monolayers as a strategy to improve the efficiency of carbamate detection in environmental monitoring. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.09.080] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Development of an amperometric immunosensor for detection of staphylococcal enterotoxin type A in cheese. J Microbiol Methods 2012; 91:138-43. [DOI: 10.1016/j.mimet.2012.05.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Revised: 05/21/2012] [Accepted: 05/22/2012] [Indexed: 11/19/2022]
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18
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Immobilization strategies to develop enzymatic biosensors. Biotechnol Adv 2012; 30:489-511. [DOI: 10.1016/j.biotechadv.2011.09.003] [Citation(s) in RCA: 723] [Impact Index Per Article: 60.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 09/02/2011] [Accepted: 09/09/2011] [Indexed: 11/18/2022]
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De Cat I, Gobbo C, Van Averbeke B, Lazzaroni R, De Feyter S, van Esch J. Controlling the Position of Functional Groups at the Liquid/Solid Interface: Impact of Molecular Symmetry and Chirality. J Am Chem Soc 2011; 133:20942-50. [DOI: 10.1021/ja209018u] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Inge De Cat
- Department of Chemistry, Division of Molecular Imaging and Photonics, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Cristian Gobbo
- Department of Chemistry, Laboratory of Self-assembling Systems, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Bernard Van Averbeke
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Roberto Lazzaroni
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Steven De Feyter
- Department of Chemistry, Division of Molecular Imaging and Photonics, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Jan van Esch
- Department of Chemistry, Laboratory of Self-assembling Systems, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
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Room temperature electrochemical synthesis of CuO flower-like microspheres and their electrooxidative activity towards hydrogen peroxide. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0663-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Biocatalytic microreactor incorporating HRP anchored on micro-/nano-lithographic patterns for flow oxidation of phenols. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.01.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Bracamonte MV, Bollo S, Labbé P, Rivas GA, Ferreyra NF. Quaternized chitosan as support for the assembly of gold nanoparticles and glucose oxidase: Physicochemical characterization of the platform and evaluation of its biocatalytic activity. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2010.10.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Silva VPAD, Alves CR, Dutra RF, Oliveira JED, Rondina D, Furtado RF. Biossensor amperométrico para determinação de peróxido de hidrogênio em leite. ECLÉTICA QUÍMICA 2011. [DOI: 10.1590/s0100-46702011000200008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Um biossensor amperométrico foi desenvolvido para detecção de peróxido de hidrogênio em amostras de leite. O biossensor foi construído a partir da imobilização de enzima peroxidase sobre eletrodo impresso de carbono. Parâmetros de otimização visando um melhor desempenho do biossensor foram avaliados. O biossensor apresentou linearidade no intervalo de 5,0 a 40,0 µ mol L-1 de H2O2 em tampão fosfato. Em amostras de leite sem diluição, os limites de detecção e quantificação foram de 0,42 µmol L-1 e 1,39 µmol L-1, respectivamente. O biossensor mostrou-se uma alternativa sensível e de baixo custo na detecção de H2O2 em amostras adulteradas de leite.
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Samanta D, Sarkar A. Immobilization of bio-macromolecules on self-assembled monolayers: methods and sensor applications. Chem Soc Rev 2011; 40:2567-92. [DOI: 10.1039/c0cs00056f] [Citation(s) in RCA: 313] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Silva MMS, Cavalcanti IT, Barroso MF, Sales MGF, Dutra RF. Gold electrode modified by self-assembled monolayers of thiols to determine DNA sequences hybridization. J CHEM SCI 2010. [DOI: 10.1007/s12039-010-0079-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hnaien M, Lagarde F, Bausells J, Errachid A, Jaffrezic-Renault N. A new bacterial biosensor for trichloroethylene detection based on a three-dimensional carbon nanotubes bioarchitecture. Anal Bioanal Chem 2010; 400:1083-92. [DOI: 10.1007/s00216-010-4336-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 10/07/2010] [Accepted: 10/12/2010] [Indexed: 12/25/2022]
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Rich RL, Myszka DG. Grading the commercial optical biosensor literature-Class of 2008: 'The Mighty Binders'. J Mol Recognit 2010; 23:1-64. [PMID: 20017116 DOI: 10.1002/jmr.1004] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Optical biosensor technology continues to be the method of choice for label-free, real-time interaction analysis. But when it comes to improving the quality of the biosensor literature, education should be fundamental. Of the 1413 articles published in 2008, less than 30% would pass the requirements for high-school chemistry. To teach by example, we spotlight 10 papers that illustrate how to implement the technology properly. Then we grade every paper published in 2008 on a scale from A to F and outline what features make a biosensor article fabulous, middling or abysmal. To help improve the quality of published data, we focus on a few experimental, analysis and presentation mistakes that are alarmingly common. With the literature as a guide, we want to ensure that no user is left behind.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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Vidotti M, Cerri CD, Carvalhal RF, Dias JC, Mendes RK, Córdoba de Torresi SI, Kubota LT. Nickel hydroxide electrodes as amperometric detectors for carbohydrates in flow injection analysis and liquid chromatography. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.09.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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Electrochemical and spectroscopic characterization of screen-printed gold-based electrodes modified with self-assembled monolayers and Tc85 protein. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.07.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Fabrication of self-assembled oligophenylethynylenethiol monolayer for electrochemical glucose biosensor. Ultramicroscopy 2009; 109:911-5. [DOI: 10.1016/j.ultramic.2009.03.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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31
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Arya SK, Solanki PR, Datta M, Malhotra BD. Recent advances in self-assembled monolayers based biomolecular electronic devices. Biosens Bioelectron 2009; 24:2810-7. [DOI: 10.1016/j.bios.2009.02.008] [Citation(s) in RCA: 169] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 02/06/2009] [Accepted: 02/10/2009] [Indexed: 11/25/2022]
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Mendes RK, Carvalhal RF, Stach-Machado DR, Kubota LT. Surface plasmon resonance immunosensor for early diagnosis of Asian rust on soybean leaves. Biosens Bioelectron 2009; 24:2483-7. [PMID: 19200709 DOI: 10.1016/j.bios.2008.12.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 12/20/2008] [Accepted: 12/22/2008] [Indexed: 11/20/2022]
Abstract
Soybean rust (Asian rust) is a disease that occurs in soy cultures, negatively affecting pod formation and final grain weight and reducing value and product quality. Early identification of fungus in the plants prevents severe farming losses and spread to neighboring cultures. In this paper, a fast response sensor was developed based on surface plasmon resonance to detect Asian rust in soybean leaf extract at early stages of the disease. The antibody anti-Phakopsora pachyrhizi (pathogen) was covalently immobilized on a gold substrate via a self-assembled monolayer (SAM) of thiols using cysteamine-coupling chemistry. This immunosensor presented a linear response range for the antigen from 3.5 to 28.0 microg mL(-1) (r(2)=0.996). The effects of the antibody amount and the surface blocking to minimize non-specific adsorption on immunosensor response were evaluated. These studies provide new perspectives on using SPR technology for the development of a highly sensitive sensor for agricultural applications.
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Affiliation(s)
- R K Mendes
- Institute of Chemistry, State University of Campinas, 13083-970, PO Box 6154, 13083-970 Campinas, SP, Brazil
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Enhancement of carcinoembryonic antibody immobilization on gold electrode modified by gold nanoparticles and SiO2/Thionine nanocomposite. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.01.016] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Vidal JC, Duato P, Bonel L, Castillo JR. Use of polyclonal antibodies to ochratoxin A with a quartz–crystal microbalance for developing real-time mycotoxin piezoelectric immunosensors. Anal Bioanal Chem 2009; 394:575-82. [DOI: 10.1007/s00216-009-2736-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2008] [Revised: 02/25/2009] [Accepted: 03/02/2009] [Indexed: 11/27/2022]
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Qu X, Bond A, Martin L. Interference from Trace Copper in Electrochemical Investigations Employing Carboxylic Acid Terminated Thiol Modified Gold Electrodes. ELECTROANAL 2009. [DOI: 10.1002/elan.200804462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Role of SAM Chain Length in Enhancing the Sensitivity of Nanopillar Modified Electrodes for Glucose Detection. SENSORS 2009; 9:1295-305. [PMID: 22573954 PMCID: PMC3345854 DOI: 10.3390/s90301295] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 02/24/2009] [Accepted: 02/24/2009] [Indexed: 11/30/2022]
Abstract
In this report, alkanethiol self assembled monolayers (SAM) with two different chain lengths were used to immobilize the functionalizing enzyme (glucose oxidase) onto gold nanopillar modified electrodes and the electrochemical processes of these functionalized electrodes in glucose detection were investigated. First, the formation of these SAMs on the nanopillar modified electrodes was characterized by the cyclic voltammetry and electrochemical impedance spectroscopy techniques, and then the detection sensitivity of these functionalized electrodes to glucose was evaluated by the amperometry technique. Results showed that the SAM of alkanethiols with a longer chain length resulted in a higher degree of surface coverage with less defect and a higher electron transfer resistance, whereas the SAM of alkanethiols with a shorter chain length gave rise to a higher detection sensitivity to glucose. This study sheds some new insight into how to enhance the sensing performance of nanopillar modified electrodes.
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Electrochemical study of self-assembled cysteine monolayers on polycrystalline gold electrodes and functionalization with microperoxidase MP-11. J APPL ELECTROCHEM 2009. [DOI: 10.1007/s10800-008-9762-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Wu F, Hu Z, Xu J, Tian Y, Wang L, Xian Y, Jin L. Immobilization of horseradish peroxidase on self-assembled (3-mercaptopropyl)trimethoxysilane film: Characterization, direct electrochemistry, redox thermodynamics and biosensing. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.06.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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